Hinman was rushed to Sky Ridge Medical Center with scrapes and bruises, and O'Riley went to an animal hospital.

Doctors treated and released both Hinman and the dog, but Monday morning, O'Riley went back into the hospital.

"We laid on the floor with him and he wasn't breathing well," Hinman said. "He wouldn't eat, he wouldn't drink."

The driver is described as a white man in his 40s with facial hair and long dark hair, according to police. He is described as wearing a white T-shirt.

Hinman believes the man drove a Dodge Caravan.

"We understand that people get scared out there when things like this happen," Lone Tree Police Commander Ron Pinson. "They don't really know what to do, but you know, just come forward. Tell us what happened. Tell us your side of the story."